| 摘要 |
<p>The device (2) has an endless belt (4) that is looped around an inner board (3). The belt exhibits a reduced friction co-efficient on an inner side of the board, where a cross sectional circumference of the board corresponds to cross sectional circumference of the endless belt. Casings are provided at an end of the board. The casings partially grip the endless belt at a lower side. Handles are provided at the casings. The board is surrounded by a cloth (14), which is coated with Teflon (RTM: PTFE) and silicone. The handles are designed in a star or loop type.</p> |
